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J. R. MUFFATT. SEWING MACHINE. APPLICATION FILED JUNE 24.12am.

Patented June 17', 1919.

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J. R. MOFFATT. SEWING MACHINE. APPucmoN rum JUNE 2, ma.

Patented June 17, 1919.

3 SHEETS-SHEET 2 J. R. MOFFATT.

SEWING MACHINE.

APPLICATION mm was. 1910. 7 1,307,264. Patented June 17, 1919.

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UNITED STATES LIZXLFENT OFFICE.

JAMES R. MOFFATT, OF CHICAGO, ILLINOIS, ASSIGNOR TO UNION SPECIALMACHINE COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

SEWING-MACHINE.

Application filed June 24, 1918.

To all whom it may (1011mm Be it known that I, .lmuns It. Moriwr r, a.citizen of the United Slates, residing at Chicago, in the county ofCook, State of Illinois, have invented certain new and usefulimprovements in Sewing-hlachines, ol which the following is adescription, reference being had to the accompanyin drawing and to thefigures of reference mar-lied thereon.

The invention relates to new and useful improvements in throat platesl'or sewing machines, and more particularly to a throat plate for a.sewing machine nherein the stitch forming mechanism is of the singlel'lllllll stitch type.

In the patent granted to 11. (l. hnnlwalll, January 11th, 1916, No.l,'l(37,4 J3, there is shown, described and claimed a threat plateconstruction for a single thread chain stitch machine, wherein a barextends across the throat plate just in rear of the path of the needle,which her operates to position the needle loop formed at one needlepuncture for the entrance of the needle at the next needle puncture. Ithas been the practice to solder these bars to the throat plate. The barnecessarily is located very close to the path of the needle; and if theneedle becomes deflected, even to a slight extent, it will strike andnick the bar-often breaking the bars and tearing them loose from thethroat plate.

An object of the present invention is to provide a throat plate of theabove charao ter with a bar for each needle hole in the throat plate,which bar is carried by supporting means detachably. connected to thethroat plate, so that the bar may be readily removed it broken ordamaged and other bars substituted therefor-mot requiring the entirereconstruction of the throat plate.

In the drawings which show b way of illustration one embodiment of theinvention,

Figure 1 is a view, partly in vertical section and partly in endelevation, showing more or less diagrammatically, a sewing machinehaving a throat plate with my improvements applied thereto; i

Fig. 2 is a. plan View of the throat plate and the important partsbeneath the work sup 0rt;

1g. 3 is an enlarged top plan View of the throat plate;

Specification of Letters Patent.

Patented June 1 '7, 1919.

Serial No. 241,543.

Fig. -l is an enlarged bottom plan view of the throat plate;

Fig. 5 is a sectional view on the line .c-:r of Fig. 4';

Fig. (5 is a sectional view on the line of F 4'; V

Fig. 7 is a sectional view on the line of Fig. 5;

Fig. 8 is a bottom perspective view of a portion of the throat platewith the bar sup orl ing means separali-d therefrom; and

Fig. 1' is a detail. in vertical section. slion inc the 1H isil'ion ol'the needle, the looper and the sup mrting bar for the needle thread loopjust a the needle is enteringthe loop.

My invention is directed to a loop supporling bar for a single threadchain stitch machine, and particularly a machine wherein the loopermoves in the direction of feed as it enters the needle thread loop, andretains the needle thread loop, so that the needle on its descent willenter the said loop. thus forming a series of enchained loops or thewell known single thread chain stitch. W'ithout the use of a supportingbar the needle thread loop is liabl to twist or the strands become sonested together that the needle will sometimes pass outside of theneedle loop, thus skipping, the stitches. This supporting bar holds theloop in proper position. so as to insure that the needle point willenter the loop. Furthermore, the loop supporting bar is especiallyuseful on long stitches, as in basting, as it holds the loop nearer tothe vertical and prevents the loop from slipping off the looper duringthe baelo ward travel thereof. In the Woodward patent the bar issoldered to the throat plate 0: otherwise permanently attached thereto.The present invention is directed to the particu lar means forsupporting the bar for holding the loop, and consists in providing aseparate bar for each needle where the device is used in a multipleneedle machine, and a detachable supporting member for each bar, so thatthe bars may be quickly removed and replaced, if broken or damaged inany way.

Referring more in detail to the drawings, I have shown my invention asapplied to a sewing machine having a supporting head 1, carryin a needlebar 2, in which is mounted a plura ity'of needles 3. The material isheld on the work support by a presser foot 4 and is fed across the worksupport by a feed ltl Lftl

dog 5, carried By a feed bar 6; which is: moved hack and forth by a feedmaker 7. Thefeed bar is raised and lowered by an ee- (ellll'it a,varried by the food ahwit t). (10 opt-ratingwith each needle is a looperit), mounted on a looper carrier it, which in turn is carried hy a shaft12. Also mounted oineae'h loopen earrier is a needle guard 13. Theseparts lll't' of the eons trln-tion shown in the \\'oodward patent,reterl'tal to, and fur ther description thereol' ie not thought net-es.sary.

Mounted on the work. support is a throat plate 15). This throat plateill is provided with a needle opening or throat ll, one for vavh needle3: it is; also provided with a series of lei-d slots 15, and the feeddog .3 is l'orlned with a series ol' sei'tions. one for oath teed elot.it will he noted l ltlltl l ig. L ol the drawings that the teed set-lionare so shaped and arranged as to engagl the material dirertlf in rear ollilt'll tlttllh opening in llH' throat plate and alongsidw oi' theneedle openings.

The throat plate on its lllnlorlamis l'orined with a groove it and. witha Heating recess 17. Mounted in the groove it? and. the seating recess17 is a shank ineniher 18, carrying the loop supporting bar l t). Theloop supporting bar-is formed as a part of the shank, said shank havingan opening 20 (lireetl)" in iront of the hat r 19. and a ent awayClearance 21 for thelooper dirt-oily in front oi" the opening 20. Thehar 19 seats in the rer'ess 1Tand this roress is so positioned that thebar 19 extends aeros the needle slot or opening li, so that the needlepassing down through the opening it will'also pass through the opening20 and direetly in front of the bar iii. in etleet, therefore, the har19 extends across? the needle opening, just in the rear ol tlieneedleand close to the path of the needle. This reeees 17 ie preferably madeby a inilicnt W'hi'eheX- tends across the throat plate. v

In Fig. 9 of tile drawings, I have indicated the needle:threadat'rranclthe' needle loopjat Z.i Int this. figure,f it'wili he noted thattheeneedie point is just enteringtiie needle. thread loop. 7 extendingfrom the previoi sfneedl pnnotnre and this needle threadvloop leadin ifroni the looper, Where it is still held, in) t J previous needle'unctnre, (i -awn across the bar 19. The sit]?- porting. bar not only pits the needle loop under'slight tension and; holds itnp against thelooper, ,hiit it will hold the two strands oflthe loo andftheoloopitelf, soth'at'th e needlerw-ill with Certainty; pass between thestnandsmfthe. p and intothe, neeitlle threadloop; Hithe needlevbeeonfiesslightly bent 011 defl'eetetidn any way, whi'chiis ery likQl IatO occur,ov ving to the feed of the fabric and the pull on the needle in thesetting of the stitch, said needle is liable to strike of Wear'aga'instthe bar 19. Sometimes these bars heeonie nicked and sometimes broken, sothat they become inetiieient or neeless and have to he replaeed This mayhe readily areoniplished hy removing o the=snpporting shank with the barIt) and replacing the same hy another, said shank being held in thegroove to by the screw It will he noted that in cutting the throat plateto 'lorlti the seating recess 17 a portion of the throat plate, asindicated at ill, is left whieh extends underneath the loop supportinghair 19. As a result, ii the lieetlle should strike the bar the blowwill hetak'en h v the parts 3" ol the throat plate; and t'hia preventsthe har from being lor'n from its seat In other words the loopsnpportingl-ar 19 is pu atively held in plaie h the throat plate itsell'.lliaslnnrh ae tillll nraalle opening in the throat plate ha its ownllllltlwlitlt'lll liars and lhesl l)1|l artrat" llt'll hy separatiandimh'prndont shanks. one har may he replam-d Wilholtl ll1-llll'lilltj theother in any way whatever.

it i oliviolls that minor rhangls in the details of ron trllvtion andarralrionlvnt ol' parts may lienvade without departing l'r'oin thespirit of the invention as set torth'in' the appended rlainis.

Ila ring thne desvrih-ed n v inveiit'iom what I elain :15 new and desireto saai'nrlh llet ters Patent; is:

1. A single t-hain stitwll inarhino iii lntlihg in (Ulllliilltltiflfl ant'adltn a inin thrttidparryinu loopor cooperating with said noe'dleandmoving in the dire'tion ol' thrtmd when entering the needle loop, iltilllH 'lor operat ing the looper. a throat plate havinga nee dleopening therein fol-the nood e a liar extending aeross said needleopening} in rear ol' the path of the needle wln-rt ln' the neo- (llthread loop on tho looper" (xtem'lingto the previous needle puncture isdrawn'hy the feed across said 'snppol'tingh'a 1 and prop erly positionedfo'r'the entranbo of the was into said loop, and means 'lor"detiehahh"supporting gaid hair; \vherellfthie sani'e 'i'n'a v he removedantl'ieplaeetl atw'ill.

'2. A single chain stit eh'in'arhin'e incfhkl ing in eoinb il'i'a'ti'mi;a needle a non tlii bittl carrying looper coo iferatingwith said needie"and movingi n the direpnmi' of the" fetid wh an entering the needle1001i, moon's Mo -erating the loo'per, a throat plate 'h'ilviigq'a"needle opening therein for-the needle, a bi) extending across; said'nee'ciliiopeningiii "Tear ofth'e p'atli ofthe' neeflie, wh'e relifitheme die thread loop n the loeper'exten'diag ar the previ'onq'needle'puli'etui is dri' awr'fbfthti feed across said suppottintzbiif'ttnd pibtserlt p sition et for the entrance of the needie into said166 1); said thf'ha'li'pltittfhaiiiighi groove fOIHiBd iIl its underface andyafietit in}: reees adjaeem the needle nfieni rig, I asupporting shank for said barysaitl shiihk 'wfl being adapted to seat insaid groove and having its forward end carrying the bar seated in saidrecess, and means for holding the shank in place in said groove.

3. A single chain stitch machine including in combination, a pluralityof needles, a non-thread carrying looper cooperating with each needleand moving in the direction of the feed when entering its needle threadloop, means for operating the loopers, a throat plate having a needleopening therein for each needle, a separate bar for each needle openingextending across the needle opening in rear of the path of the needle,whereby the needle thread loop on the looper of the needle passingthrough the needle opening and extending to the previous nee dlepuncture of said needle is drawn by said feed across said supporting barin proper position for the entrance of the needle into said loop, andindependent means for e tachably supporting each bar.

4. A single chain stitch machine including in combination, a pluralityof needles, a non-thread carrying looper cooperating with each needleand moving in the direction of the feed When entering its needle threadloop, means for operating the loopers, a threat plate having a needleopening therein for each needle, a separate bar for each needle openingextending across the needle opening in rear of the path of the needle,Whereby the needle thread loop on the looper of the needle passingthrough the needle opening and extending to the previous needle punctureof said needle is drawn by said feed across said supporting bar inproper position for the entrance of the needle into said loop, saidthroat plate having a groove adjacent each needle opening, ashankcarrying the loop supporting bar for each needle opening mounted in saidgroove, and means for retaining the shank in its groove.

5. A single chain stitch machine including in combination a needle, anon-thread carrying looper cooperating with said needle and moving inthe direction oi the feed when ontering the needle loop, means foroperating the looper, a throat plate having a needle opening therein forthe needle, a bar extend ing across said needle opening in rear of thepath of the needle, whereby the needle thread loop on the looperextending to the previous needle puncture is drawn by the feed acrosssaid supporting bar and properly positioned for the entrance of theneedle into said loop, said throat plate having a seating recessadjacent the needle opening for receiving and supporting the loopsupporting bar, said throat plate having a portion thereoi extendingunderneath the bar, whereby the downward thrust on the bar by the needlestriking the same will be taken by the throat plate.

6. A single chain stitch machine including.

in combination, a needle, a non-thread carrying looper co perating withsaid needle and moving in the direction of the feed when entering theneedle loop, means for operating the looper, a throat plate having aneedle opening therein for the needle, :1 bar extending across saidneedle opening in rear of the path of the needle, whereby the needlethread loop on the looper extending to the previous needle puncture isdrawn by the feed across said supporting bar and properly positioned forthe entrance of the needle into said loop, said throat plate ha ving agroove formed in its under face, a supporting shank for said bar, saidshank being adapted to seat in said groove, and means for holding theshank in place in said groove.

In testimony whereof, I a'liiX my ignature, in the presence of twowitnesses.

JAMES R. MOFFATT.

Witnesses S. Gnome TATE, E. A. Ro'rimcnnn.

Copies of this patent may be obtained for live cents each, by addressingthe Commissioner of Patents, Washington, D. G.

